What is the locality of the data and why does it matter in Cloud Spanner or MySQL?

Question

Data locality and root tables are not a concept in MySQL or PostgreSQL, so why they matter in Cloud Spanner.

It seems that collecting primary keys is very important in your design for Cloud Spanner.

Answer 1

I think data locality and root tables are important in MySQL or PostreSQL, like in Cloud Spanner, but they are called differently.

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, MySQL PostgreSQL, ;)